The behavior of pre-corrosion effect on the performance of imidazoline-based inhibitor in 3 wt.% NaCl solution saturated with CO2
The behavior of pre-corrosion effect on the performance of imidazoline-based inhibitor in 3 wt.% NaCl solution saturated with CO2
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DOI：
10.1016/j.apsusc.2015.08.003
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发表时间：
2015-11
影响因子：
6.7
通讯作者：
Huan-huan Zhang;Xiaolu Pang;Meng Zhou;Chao Liu;Liangtian Wei;K. Gao
中科院分区：
文献类型：
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作者：
Huan-huan Zhang;Xiaolu Pang;Meng Zhou;Chao Liu;Liangtian Wei;K. Gao
合成了一种咪唑啉类缓蚀剂，对其进行了表征，并在CO2饱和的3 wt.% 60 °C下的NaCl溶液。评价了预腐蚀对缓蚀剂缓蚀效果的影响。结果表明，该缓蚀剂对新磨试样具有良好的缓蚀效果，当缓蚀剂浓度为2.4390 × 10− 5 mol/l时，缓蚀率可达98.7%。缓蚀剂在钢表面的吸附符合Langmuir吸附等温线和化学吸附。预腐蚀对缓蚀剂的缓蚀性能有不利影响，在1.2195 × 10− 5 mol/l缓蚀剂的预腐蚀样品浸泡96 h后观察到明显的局部腐蚀。缓蚀剂对预腐蚀时间不同的试样缓蚀效果的差异与预腐蚀后腐蚀产物的不同和比表面积的增加有关。
An imidazoline-based inhibitor was synthesized, characterized and tested as a corrosion inhibitor for low alloy steel in CO2-saturated 3 wt.% NaCl solution at 60 °C. The influence of pre-corrosion on inhibition efficiency of the inhibitor was evaluated. The results showed that the inhibitor had excellent inhibition effectiveness on freshly abraded samples, with an inhibition efficiency of 98.7% in the presence of 2.4390 × 10−5mol/l inhibitor. The adsorption of the inhibitor on the steel surface was found to obey Langmuir's adsorption isotherm and chemisorption. Pre-corrosion had a detrimental effect on the inhibitor performance, significant localized corrosion was observed on the pre-corroded samples with 1.2195 × 10−5mol/l inhibitor after 96 h immersion. The differences in inhibition efficiency of the inhibitor for samples pre-corroded for different time were related to the different corrosion products and the increase of surface area after pre-corrosion.